how can we save enegry by using VFD for Resiprocating Air compressor which is having more unloading running hours

0 Answers   MRF,

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I have carried out wiring for lighting in a shed in Industrial area which contains Metal halide lamps & have balanced in 3ph.Now when we put all the lines on in the daytime the current taken at 3phases at MCB comes to be equal i.e.28,29,28Amps respectively but in the night time i.e between 7p.m.to 11p.m. at the same MCb the current is 52,59,62Amp, though I have fit 63A MCB it is tripping in the above period.What may be the reason.? Note: This industry is located in industrial area where majority of steel ingot manufacturing plants are there. Whether this may be due to harmonic? what should I do to overcome above problem.pl suggest urgently.

4 Answers  

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What is the formula for selecting the cabels according to load? How to calculate what sq.mm cabel to be used?

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what is significance of B-H curve? how it differs form ordinary transformers to Amorphous Transformer?

2 Answers   BARC,

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When we need start the motor by method of star delta which size (KW or HP)motor should must be operate in Star Delta Method,

3 Answers  

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what is the use of vector group in transformer. means what r the application of various vector groups?

5 Answers  

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to vary valtage from 0 - max a variac is necessary . so how to design for high power applications nearly about 200KW power

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How to generate neutral in DG set?

3 Answers  

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State kirchoff current law?

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Some times to change of DOR of a motor, interchange of R & B is not effected and RYB take same current, but interchange of R&Y is effected ie change the DOR. My doubt is what is the problem in motor and how it is happen.

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what type of relay has to be used for tripping the circuit from mains when a fault occur in a machine

3 Answers  

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how actually an anti pumping device works? what is the operational principal?

2 Answers  

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